#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n;
    cin >> n;
    set<ll> S;
    string ans;
    auto dfs = [&](auto dfs, ll v) -> void {
        if(v == 1){
            reverse(ans.begin(), ans.end());
            cout << ans << '\n';
            exit(0);
        }
        if(S.count(v)) return;
        S.insert(v);
        if((v - 1) % 3 == 0){
            ans += 'B';
            dfs(dfs, (v - 1) / 3);
            ans.pop_back();
        }
        if((v - 1) % 2 == 0){
            ans += 'A';
            dfs(dfs, (v - 1) / 2);
            ans.pop_back();
        }
    };
    dfs(dfs, n);
}